Is there a way to calculate the volume difference between two objects?
If you go to edit&gt;properties&gt;Addons and enable the 3d print toolbox add-on then click on the 3d-print tab on the right side of your viewport you can click volume to get a numerical value for the volume of the object. From there you can either get both volumes and do the math yourself or you can bool the 2 objects and use the 3d-print tools to get the volume of the result.